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Cold Advisory for Newborn Livestock (CANL) System


The Cold Advisory for Newborn Livestock or CANL is an NWS product that provides guidance on hazards that may affect all newborn livestock, but especially cattle. CANL is available in a graphical format out 36 hours. CANL ranks the risk to livestock from None to Extreme. Click here for more information on CANL and its criteria.




CANL Legend





Four Panel Forecast of CANL, Precip, Wind Chill, & RH







More Information on CANL

The CANL index is designed to indicate weather conditions dangerous to newborn livestock, especially calves. Newborn livestock less than 24‐hours old are least able to regulate their body temperature and therefore most susceptible to the cold.  Also, after several hours, producers may have had a chance to get to the animal, dry it off, and provide shelter as needed. 

The criteria for the index were derived from interviews with ranchers and from scientific research on the topic. Based on this research, the following elements are dangerous at some level to exposed newborns:

  • Windchill
  • Rain or Wet Snow
  • High Humidity (due to the difficulty for newborns to dry-off)
  • Combinations of these elements (such as windchill and rain) are particularly dangerous

If the following conditions are met within a 6-hour period, the associated index and advisory will be:

  • None: Wind Chill above 41 degrees
  • Slight: Wind Chill below 41 degrees for more than 2 hours.
  • Mild: Wind Chill below 32 degrees for more than 2 hours.
  • Moderate: Wind Chill below 0 degrees for more than 2 hours. or Wind Chill below 36 degrees and more than .02 inches of precip.
  • Severe: Wind Chill below -9 degrees for more than 2 hours or Wind Chill below 34 degrees and more than .05 inches of precip.
  • Extreme: Wind Chill below -18 degrees for more than 2 hours or Wind Chill below 32 degrees for 2 hours and more than 0.1 inches of precip.
For sunny conditions (sky cover < 40%), reduce Wind Chill thresholds by 10 degrees.
For humid conditions (min RH > 95%), increase Wind Chill thresholds by 10 degrees.
For dry snow (Max Temp. < 26 degrees), double the precipitation thresholds for Moderate-Extreme

CANL Product Fact Sheet

Inquiries about this product should be sent to: Vernon.Preston@noaa.gov


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